FAMILY CHLOROGENACEAE 



1157 



3. Aureogenus clavifolium Black. 

 (Proc. Am. Philos. Soc, 88, 1944, 141.) 

 From Latin clava, club, a.nd folium, leaf. 



Common name : Clover club-leaf virus. 



Host: Experimentally, LEGUMIXO- 

 SAE — Trifolium incarnatum L., crimson 

 clover. 



Insusceptible species: SOLAX A- 

 CEAE — Nicotiana rustica L., Indian to- 

 bacco ; Solanum tuberosum L., potato. 



Geographical distribution : United 

 States (Princeton, X. J.). 



Induced disease : In crimson clover, ex- 

 ])erimentalh-, j-oungest leaves lighter 

 green than normal, slow to unfold; leaf 



margins jellowed or colored red or purple 

 red; affected leaves narrow, smooth or 

 savoyed; plant dwarfed, new shoots from 

 leaf axils slightly stimulated ; new growth 

 of spindly stems and small leaves; no 

 rusty-brown necrosis of veins, no obvious 

 enlargement of veins, and no obvious 

 clearing of veins at the onset of disease. 

 Transmission : Xot by inoculation of 

 expressed juice. By leafhopper, Agal- 

 liopsis novella (Say) (CICADELLI- 

 DAE) ; not by leafhoppers, Aceratagallia 

 sanguinolenta (Provancher), Agallia con- 

 stricia Van Duzee, nor ^4. quadripunctata 

 (Provancher) (CICADELLIDAE). 



Genus V. Galla Holmes. 



(Loc. cit., 106) 



Viruses of the Fiji-Disease Group, inducing diseases characterized by vascular 

 proliferation. Generic name from Latin galla, a gall nut. 

 The type species is Galla fijiensis Holmes. 



Key to the species of genus Galla. 



I. Infecting sugar cane. 



A. Inducing formation of conspicuous galls. 



1. Galla fijiensis. 



B. Xot inducing formation of conspicuous galls. 



2. Galla queenslandiensis . 

 II. Infecting anemone. 



3. Galla anemones. 



III. Infecting peach. 



4. Galla verrucae. 



IV. Infecting corn. 



5. Galla zeae. 



1. Galla fijiensis Holmes. (Handb. 

 Phytopath. Viruses, 1939, 106.) From 

 name of Fiji Islands. 



Common name: Fiji-disease virus. 



Host : GRAM I XEAE—Saccharum offi- 

 cinarum L., sugar cane. 



Geographical distribution : Fiji Islands, 

 X'ew South Wales, Java, Philippine Is- 

 lands, Xew Guinea and Xew Caledonia. 



Induced disease: In sugar cane, galls 

 on vascular bundles, formed by prolifera- 

 tion of phloem and nearby cells. Af- 

 fected cells show characteristic spherical 

 or oval inclusion bodies. Developing 

 leaves shortened, crumpled, abnormally 



dark green. Infected stools of cane be- 

 come bush}^ Roots small, bunchy. 



Transmission: By leafhoppers, Perkin- 

 siella saccharicida Kirk, (in Queensland) 

 and P. vastatrix Breddin (in Philip- 

 pine Islands) {FULGORIDAE, sub- 

 family Delphacinae) . Xot by grafting. 

 Xot by inoculation of expressed juice. 

 Xot through eggs of P. vastatrix. Cut- 

 tings taken from affected canes produce 

 some healthy and some diseased plants, 

 because virus does not become uniformly 

 distributed throughout the host tissues. 



Literature: Kunkel, Bull. Exp. Sta., 

 Hawaiian Sugar Planters' Assoc, Bot. 



